Stress estimated using microseismic clusters and its relationship to the fracture system of the Hijiori hot dry rock reservoir

Tezuka, Kazuhiko; Niitsuma, Hiroaki

doi:10.1016/s0013-7952(99)00133-7

Cited by 93 publications

(31 citation statements)

References 10 publications

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“…In the geothermal domain, such projects constitute expensive experiments and thus are relatively few in number, whereas, in the oil and gas domain, where hydro-fracture operations are frequent and routine, the data tend to be proprietary. Nevertheless, some notable datasets have been acquired for deep brine injection projects (Ake et al, 2005;Block et al, 2015), deep scientific drilling projects such as the German KTB project (Zoback and Harjes, 1997;Emmermann and Lauterjung, 1997;Jost et al, 1998;Baisch and Harjes, 2003), and hydraulic fracturing for oil and gas production enhancement (Warpinski, 2009;Das and Zoback, 2011;Dusseault et al, 2011;Pettitt et al, 2011;Vermylen and Zoback, 2011;Boroumand and Eaton, 2012;Bao and Eaton, 2016) and during the stimulation of deep geothermal boreholes (Parker, 1989;Jupe et al, 1992;Cornet and Scotti, 1993;Tezuka and Niitsuma, 2000;Asanuma et al, 2005;Evans et al, 2005a;Häring et al, 2008;Brown et al, 2012;Baisch et al, 2015). Welldocumented hydraulic stimulation datasets generally include microseismic observations as well as injection pressures and flow rates and, occasionally, tilt monitoring (Evans, 1983;Warpinski and Teufel, 1997).…”

Section: Stimulation By Hydraulic Shearingmentioning

confidence: 99%

“…Batchelor et al (1983) summarize microseismicity observed during the stimulation injections into the Phase 2a and 2b reservoirs at Rosemanowes in Cornwall, UK. Tezuka and Niitsuma (2000) examined clusters of microseismic events generated during the stimulation of the 2200 m deep reservoir at the Hijiori EGS site in Japan. Baisch et al (2006Baisch et al ( , 2009Baisch et al ( , 2015 analyzed data from different stages of the stimulation of the Habanero EGS reservoir in the Cooper Basin, Australia.…”

Section: Induced Seismicitymentioning

confidence: 99%

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The seismo-hydromechanical behavior during deep geothermal reservoir stimulations: open questions tackled in a decameter-scale in situ stimulation experiment

et al. 2018

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Abstract. In this contribution, we present a review of scientific research results that address seismo-hydromechanically coupled processes relevant for the development of a sustainable heat exchanger in low-permeability crystalline rock and introduce the design of the In situ Stimulation and Circulation (ISC) experiment at the Grimsel Test Site dedicated to studying such processes under controlled conditions. The review shows that research on reservoir stimulation for deep geothermal energy exploitation has been largely based on laboratory observations, large-scale projects and numerical models. Observations of full-scale reservoir stimulations have yielded important results. However, the limited access to the reservoir and limitations in the control on the experimental conditions during deep reservoir stimulations is insufficient to resolve the details of the hydromechanical processes that would enhance process understanding in a way that aids future stimulation design. Small-scale laboratory experiments provide fundamental insights into various processes relevant for enhanced geothermal energy, but suffer from (1) difficulties and uncertainties in upscaling the results to the field scale and (2) relatively homogeneous material and stress conditions that lead to an oversimplistic fracture flow and/or hydraulic fracture propagation behavior that is not representative of a heterogeneous reservoir. Thus, there is a need for intermediate-scale hydraulic stimulation experiments with high experimental control that bridge the various scales and for which access to the target rock mass with a comprehensive monitoring system is possible. The ISC experiment is designed to address open research questions in a naturally fractured and faulted crystalline rock mass at the Grimsel Test Site (Switzerland). Two hydraulic injection phases were executed to enhance the permeability of the rock mass. During the injection phases the rock mass deformation across fractures and within intact rock, the pore pressure distribution and propagation, and the microseismic response were monitored at a high spatial and temporal resolution.

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Section: Stimulation By Hydraulic Shearingmentioning

confidence: 99%

Section: Induced Seismicitymentioning

confidence: 99%

The seismo-hydromechanical behavior during deep geothermal reservoir stimulations: open questions tackled in a decameter-scale in situ stimulation experiment

et al. 2018

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“…Results of monitoring of hydraulic fracturing experiments have been reported (e.g., JUPE et al, 1992;CORNET et al, 1997;PHILLIPS et al, 1997;SASAKI, 1998). The analysis of microseismic locations provides information on the fracture growth, the main¯ow direction, and the drilling target of a new well, while the focal mechanisms of the microseismic events provide other information on the stress state (e.g., CORNET and JULIEN, 1989;CORNET and YIN, 1995;TEZUKA and NIITSUMA, 2000).…”

Section: Introductionmentioning

confidence: 99%

“…However, there is no objective means by which to make this selection. Several inverse methods have been proposed to determine the stress ®eld which is most consistent with a set of focal mechanism data (e.g., VASSEUR et al, 1983;GEPHART and FORSYTH, 1984;MICHAEL, 1987;RIVERA and CISTERNAS, 1990). Among them, GEPHART and FORSYTH (1984) have developed an inversion method that attempts to select the correct fault planes while inverting the stress state.…”

Section: Introductionmentioning

confidence: 99%

Determination of Stress State from Focal Mechanisms of Microseismic Events Induced During Hydraulic Injection at the Hijiori Hot Dry Rock Site

Sasaki¹,

Kaieda²

2002

Pure appl. geophys.

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Ð The stress state at the Hijiori hot dry rock site was estimated based on the inversion from focal mechanisms of microseismic events induced during hydraulic injection experiments. The best ®t stress model obtained by inverting 58 focal mechanisms of seismic events simultaneously indicates that the maximum principal stress r 1 is vertical, while the minimum principal stress r 3 is horizontal and trends north-south. The average mis®t between the stress model and all the data is 6.8°. The inversion results show that the average mis®t is small enough to satisfy the assumption of homogeneity in the focal mechanism data and that the 95% con®dence regions of r 1 and r 3 are well constrained, i.e., they do not overlap, suggesting that the inversion results are acceptable. The stress estimates obtained by the focal mechanism inversion essentially agree with other stress estimates previously obtained. It is therefore concluded that the focal mechanism inversion method provides a useful tool for estimating the stress state. The hypocentral distributions of microseismic events associated with the hydraulic fracturing experiments are distributed around the plane that spreads to almost east±west from the injection wells and declines to the north at a high angle. The vertical orientation and east±west strike of the seismic events are essentially coplanar with the caldera ring-fault structure in the southern portion of the Hijiori Caldera. This indicates that tensile fractures of intact rock were not being created, but pre-existing fractures were being re-opened and developed in the direction of the maximum horizontal principal stress, although microseismic events were caused by shear failures.

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“…Plenty of engineering applications of microseismic monitoring technique were carried out in South Africa, Canada, Japan, Australia and North America. Significant achievements have been obtained in open pit slopes (Abdul-Wahed et al, 2006;Lynch et al, 2005), underground mining (Ge, 2005;Hudyma, 2008;Mendecki, 2000), tunnels (Hirata et al, 2007;Milev et al, 2001), oil and gas exploration and development, and electricity generation by hot dry rock (Tezuka and Niitsuma, 2000) etc. The application and its related theory of microseismic monitoring technique have been also investigated in China.…”

mentioning

confidence: 99%

Application of Microseismic Monitoring Technique in Hydroelectric Projects

Xu¹,

Tang²,

Li³

et al. 2012

Hydropower - Practice and Application

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Stress estimated using microseismic clusters and its relationship to the fracture system of the Hijiori hot dry rock reservoir

Cited by 93 publications

References 10 publications

The seismo-hydromechanical behavior during deep geothermal reservoir stimulations: open questions tackled in a decameter-scale in situ stimulation experiment

The seismo-hydromechanical behavior during deep geothermal reservoir stimulations: open questions tackled in a decameter-scale in situ stimulation experiment

Determination of Stress State from Focal Mechanisms of Microseismic Events Induced During Hydraulic Injection at the Hijiori Hot Dry Rock Site

Application of Microseismic Monitoring Technique in Hydroelectric Projects

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